Variable pressure control device

A circuit for operating a control valve system comprising:

• an inlet, an outlet, and an exhaust;
• a first passage extending between said inlet and said outlet;
• a second passage extending between said outlet and said exhaust;
• a first valve disposed within said first passage, said first valve being movable between a closed position and an opened position;
• a second valve disposed within said second passage, said second valve being movable between a closed position and an opened position;
• a regulator circuit operably outputting a pilot pressure in response to a control signal;
• and
• an actuating member slidably moveable in response to a pressure differential between said outlet and said pilot pressure, said actuating member independently actuating said first valve and said second valve.

A control valve system comprising:

• a housing defining an inlet, an outlet, and an exhaust;
• a first passage extending between said inlet and said outlet;
• a second passage extending between said outlet and said exhaust;
• a first valve disposed within said first passage, said first valve being movable between a closed position and an opened position;
• a second valve disposed within said second passage, said second valve being movable between a closed position and an opened position;
• an adjustable proportional regulator fluidly coupled to said inlet, said proportional regulator outputting said pilot pressure in response to a control signal;
• a quick exhaust valve member disposed between said adjustable proportional regulator and said piston member, said quick exhaust valve member being operable to selectively vent said pilot pressure;
• and
• a piston member slidably disposed within said housing, said piston member moveable in response to a pressure differential between said outlet and said pilot pressure into a first position and a second position, said piston member urging said first valve into said opened position when said piston member is in said first position, said piston member urging said second valve into said opened position when said piston member is in said second position.

A circuit for operating a control valve system comprising:

• an inlet, an outlet, and an exhaust;
• a pressure regulator operably outputting a regulator pressure in response to a control signal;
• a valve member interconnecting said inlet, said outlet, and said exhaust, said valve member being positionable in response to a pilot pressure in a first position where said inlet, said outlet, and said exhaust are each closed, a second position where said inlet is in fluid communication with said outlet, and a third position where said outlet is in fluid communication with said exhaust;
• and
• a quick exhaust valve fluidly coupled between said pressure regulator and said valve member, said quick exhaust valve positionable in a supply position to provide said pilot pressure to said valve member in response to said regulator pressure from said pressure regulator and a vent position where said pilot pressure is vented,
• wherein said quick exhaust valve is positioned into said vent position when said pilot pressure is generally greater than said regulator pressure.